| Material. | Relative Permittivity, εr | Material. | Relative Permittivity, εr | |
|---|---|---|---|---|
| Vacuum | 1 | Dry soil | 2.5-3.5 | |
| Air (at sea level) | 1.00058986 ± 0.00000050 | Plexiglass | 3.4 | |
| Styrofoam | 1.3 | Glass | 4.5-10 | |
| Teflon | 2.1 | Quartz | 3.8-5 | |
| Petroleum oil | 2.1 | Bakelite | 5 | |
| Wood (dry) | 1.5-2 | Porcelain | 5.7 | |
| Paraffin | 2.2 | Fromica | 6 | |
| Polyethylene | 2.25 | Mica | 5.4-6 | |
| Polystyrene | 2.6 | Ammonia | 22 | |
| Paper | 2-4 | Seawater | 72-80 | |
| Rubber | 2.2.-4.1 | Distilled water | 81 |